As of April 2015, several metal glues receive four-and-a-half out of five stars on Amazon, but only one has consistent five star ratings: Welder Professional by the Homax Group. Reviews for this product note its versatility, and craftspeople in particular note that its reliability makes for durable products.
On Homax's website, customer reviews for the Welder adhesive show an average of 4.9 stars. Other well-reviewed metal glues, which are generally epoxy resins, include J.B.Weld's Original Cold Weld Formula Steel Reinforced Epoxy and Permatex's PermaPoxy 4 Minute Multi-Metal Epoxy. Reviews for these are more mixed, however, bringing their average ratings down.